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The Highlands of Scotland, seen here from Eilean Donan Castle, are "beautiful with a touch of snow on the mountains," says Elaine McKinney.

While hiking up Machu Picchu in the Peruvian Amazon, Caleb Lawson and his wife Kelly photographed a group of owl monkeys peering down at them. "They are nocturnal, but poked their heads out of their home to see what was lurking," he said.

A shot with a long shutter speed captures the nighttime lights of downtown Austin.

Windmills and white buildings fill the town of Oia on the Greek island of Thira, also known as Santorini. "I don't think it was possible for me to take a bad picture," said Marlon Tse.

Spectators can enjoy live street theater and dance at Ponorogo's Heritage Festival in Indonesia's East Java province.

While kayaking off of Isla Holbox, Mexico, Amy Richardson saw a flock of birds take flight off of a nearby sandbar. "Isla Holbox is a small, quiet island... there is incredible bird population there that one can spend an entire day admiring," she said.

While traveling near his home, Lee Gunderson photographed a sunset shinning over Alberta, Canada. "Rural Alberta has so much to offer to those who like to wander," he said.

This elephant "proceeded to walk up to me and sniffed me with her trunk. She almost sniffed the end of my lens!" said Christopher Cromwell. "Once she got a good sniff of me, she seemed to calm down and I snapped this photo. It was amazing to have this massive yet gentle creature seem to accept my presence with her."

Clouds cover the Great Smoky Mountains in this view from Bryson City, Tennessee.

Shoppers make their way past beautiful fabrics and other items on display at Minab's weekly open-air market. See more photos on CNN iReport.

Sheep cross a biking path near St. Remy, France.

National Day festivities occur every year in Tiananmen Square in Beijing, China.

The Dole pineapple fields of Haleiwa, Oahu stretch across the northern part of the Hawaiian island.

Travelers scale the Erg Chebbi dunes in Morocco's Sahara Dessert.

Stilt fishermen in Sri Lanka wait for the day's catch.

Singapore's unique skyline glows in the light of dusk.

Venice "is timeless in beauty and brilliance," said Marianne Titiriga, who captured this image of one of the city's famous canals.

Sunlight streams through the trees of Muir Woods, named for naturalist and conservationist John Muir.

Muslim men gather for early morning prayer at Hamidiya Masjid in Mumbai. "The place was noisy, but as soon as the prayers started, it was so peaceful and pin-drop [silent]," said Anupama Kinagi, who captured the geometric pattern formed by so many bowed heads and bodies.

Tall ships from around the world, like this one from the Netherlands, are traveling to Australia to celebrate the centennial of the first entry of the Royal Australian Navy's Fleet into Sydney Harbour. They are docked in Fremantle for a few days before visiting other parts of the country.

Welcome to the Heidelberg Project, a neighborhood of art in Detroit. See more photos and read about the project on CNN iReport.

The active volcano Concepcion is seen from the forest atop another volcano, Maderas, which has been dormant in modern times.

"As I crossed the [Bosphorus Strait], I saw the sun set behind the mosques and historic monuments of Istanbul's Old City," said Nate Hovee.

You may recognize Devils Tower, the first national monument in the United States, from its prominent role in the 1977 film "Close Encounters of the Third Kind."

David Lee managed to snap a photo of two of the ubiquitous needlefish in Kayangan Lake before they took off. "They are as curious as they are skittish," he said.

While hiking on the glacier Svínafellsjokull in South Iceland, iReporter Erin Ramos captured this brilliant view of sunlight piercing through the clouds overhead and reflecting off the ice. "There was a beautiful contrast between the highlights and shadows. I couldn't have asked for better weather," Ramos said.

"One gets a feeling of living history in Malta," said Alan Patrick Watts, who shot this photo in the Mediterranean island nation's capital city of Valletta. It "has a huge concentration of historic sites."

An African painted dog poses near his pack in Kruger National Park. The endangered animals are also known as African wild dogs, Cape hunting dogs or painted wolves.

The Kennedy Center for Performing Arts glows as the sun sets over the Potomac River.

Visitors to Tivoli Grona Lund amusement park ride the flying swings as Sweden's summer sun sets around 10:30 p.m.

A peacock poses for the camera in Cotui, about 75 miles north of Santo Domingo. See more portraits of the colorful creature on CNN iReport.

Jerusalem's Temple Mount has been used by, and is is considered sacred to, Christianity, Islam and Judaism. See additional photos and read more on CNN iReport.

The sun sets on Mt. Magazine, the highest point in Arkansas.

Students pause to pose for the camera in Daykundi province.

Natalie Montanaro says she loves the calm waters of Pangaimotu in the South Pacific. Read more about the island on CNN iReport.

China's Stone Forest, or "Shilin," contains hundreds of tall, natural limestone formations.

It takes about two hours of hiking to reach Cathedral Cove, but for tourists who want to view its natural rock arch, seen here, it's worth it.

Old and new come together as traffic speeds past Rome's famous Colosseum at night.

Srijan Shrestha says Fewa Lake is a busy tourist attraction, so "I was fortunate to take a picture of the empty boats laying at at the lake on such a soothing calm evening."

Kenji Croman captured this wave at sunrise by wading into the surf and holding up his camera (protected by a heavy-duty waterproof case). He tries for such images almost every morning. "I usually have to take about 700 shots to get one," he said.

A blue monkey looks into the camera. "This particular guy was staring at our Jeep so intently," recalls Bambi Drisko.

The Eta Aquariids meteor shower puts on a show above Mount Bromo, an active volcano in East Java, Indonesia.

Bluebells bloom on the bank of a river in County Donegal. Jim Murphy shot this photo while on vacation with his family from County Cork.

Wild horses frolic near Reno. See more beautiful shots of the herds on CNN iReport.

The Imperial Palace is the home of Japan's Emperor and Empress, but much of the grounds are open to the public.

The ancient city of Petra, carved into sandstone cliffs in the first few centuries, famously served as the setting for several scenes in "Indiana Jones and the Last Crusade."

The neon signs of Bourbon Street light up the night. "If you ever get a chance to head to the French Quarter, do it," said John McGraw. "It is one of those places that, for us, lived up to the hype." See more photos from around New Orleans on CNN iReport.

Keith Hajovsky and his girlfriend, whose reflection is seen here, took part in a sea turtle release in El Salvador. "Releasing those little turtles was one of the most wholesome, warm-hearted experiences I've ever had," he said. Read more on CNN iReport.

Gorgeous landscapes abound in the largest national park in the United States. See more photos from the park, including its massive glaciers, on CNN iReport.

Colorful boats line the beach at Xuyen Moc. See more photos from around Vietnam on CNN iReport.

Swans swim in the frigid Nemunas River during the chilly Lithuania winter. Luckily, animal welfare officials were on hand to make sure they didn't get trapped in the ice. See more photos on CNN iReport.

Terraced fields are used to grow rice in China. See more images of the fields, including mind-boggling shots from above, on CNN iReport.

The beaches of Los Cabos, at the tip of the Baja California peninsula, are famous for their rock formations.

The Northern Lights dance over the Lyngen Alps. See more spectacular images of the phenomenon on CNN iReport.

Elephants enjoy a drink at Shaba National Reserve, where films like "Out of Africa" and "Born Free" were filmed.

Marie Santos took this photo while hiking The Narrows at Zion National Park. Much of the hike is spent wading through the river. "The views were spectacular and every angle looks different depending on how the light or shadows reflect on the rocks," she said.

The Italian village of Positano spills from the cliffs onto the beach. Christopher Foltz, who shot this photo, said it's his favorite town in the whole country.

In a traditional sport, Mongolian riders try to find and pick up a coin from the ground without falling off their galloping horse. See more photos and learn about the event on CNN iReport.

Photographer Antonina Reshef is on a mission to revisit the former USSR towns of her youth. See more of her photos from the isolated Kamchatka peninsula in eastern Russia on CNN iReport.

Water mills stand in the historic town of Huanglongxi. "I felt like I was back to the olden days," said Ter Chieng Chuan. "The unique infrastructure really impressed me."

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(CNN) -- Each day, CNN producers select a user-submitted photo to be our Travel Photo of the Day. Click through the gallery above to see stunning shots from around the world, and be sure to come back every day for a new image. Have a gorgeous travel photo of your own to share? Submit it for the gallery at CNN iReport!