The Mayan ruins and jungle canopy at Tikal, Guatemala, seen from the top of Temple II.

Channel Islands National Park from Anacapa Island, California

Cliffs of Moher from the viewing platform at the top of O'Brien's Tower at the cliffs, County Clare, Ireland.

The tiny town of Hallstatt in the Salzkammergut region of Austria, seen from the ferry ride across Lake Hallstatt.

Uluwatu Temple above the Bali Sea, viewed from the temple grounds' northern trail, Bali, Indonesia.

Phang Na Bay, Thailand, seen via longtail boat tour departing from Phuket.

The Costa Rican rainforest canopy from a Skywalk tour.

The Sydney Opera House and Harbour Bridge in Sydney, Australia,

Andes Mountains from the Atacama Desert, Chile.

Cape of Good Hope from the Cape Point funicular, South Africa.

Golden Gate Bridge and San Francisco from Hendrik Point, San Francisco.

The natural arches in Arches National Park, Utah, from the loop trail at Devil's Garden.

Mount Fuji from Lake Kawaguchiko, Japan

The ghats of Varanasi, India, at sunrise, seen from a boat on the Ganges River.

Iceland's Blue Lagoon, seen while taking a dip in the steamy waters at the Blue Lagoon Spa complex.

Rio de Janeiro and Christ the Redeemer statue, viewed from the top of Corcovado Mountain.

Milford Sound, South Island, New Zealand, seen via boat tour from Queenstown.

Mont Blanc from the Brevent cable car in Chamonix, Switzerland.

Amazon River seen via riverboat tour from Belem to Santarem, Brazil.

Li River and surrounding hills seen from a boat on the Li near Yangshuo, China.

Rome's skyline and the Vatican from the dome of St. Peter's Basilica.

The pyramids of the Giza Necropolis, Egypt.

Lake Peho and Cuernos mountains from Torres del Paine National Park, Patagonia, Chile.

Bolivian Salt Flats in the Potosi and Oruro regions of southwest Bolivia, seen from the flats.

Bagan temples in Myanmar from a hot air balloon.

Mount Kilimanjaro seen from the Serengeti, Kenya.

Acadia National Park and Bar Harbor, seen from the peak of Cadillac Mountain, Maine

The Santorini caldera in Greece, seen from the small town of Oia on Santorini.

Sunrise from atop Haleakala Volcano, Maui, Hawaii

Machu Picchu seen from Huayna Picchu, Peru.

Iguazu Falls, Argentina, from the catwalks along the Upper Falls trail.

Alpine peaks and Stubai Glacier from the Stubai Glacier Platform, Austria.

Junk boats and islands in Halong Bay, Vietnam, seen from a boat on the bay.

Langkawi Sky Bridge in Pulau Langkawi, Malaysia, from the Langkawi Cable Car ride.

Niagara Falls from the Journey Behind the Falls observation platform, Canada.

The Alps' Matterhorn from Lake Riffelsee, Switzerland.

Hidden Lake, Glacier National Park, Montana, seen from the Hidden Lake overlook, a 1 12-mile hike from Logan Pass.

The Tiger's Nest in Bhutan from the Taktsang Cafeteria along the cliffside path in Paro, Bhutan.

Auckland and its harbors from a SkyWalk tour of the Sky Tower in Auckland, New Zealand.

Goreme's rock pillars, in the Cappadocia region of Turkey, viewed from a hot air balloon.

Monument Valley from US 163, Utah and Arizona

Hong Kong skyline and Victoria Harbour from atop Victoria Peak.

Yosemite National Park including El Capitan, Half Dome and Yosemite Falls from Sentinel Dome, California.

Victoria Falls, Zambia, viewed from Knife-Edge Bridge.

Great Wall of China, viewed from the Badaling section, located about 50 miles from Beijing.

Badlands National Park from Sheep's Mountain Table, South Dakota.

New York City viewed from the Top of the Rock observation deck at Rockefeller Center.

Mt. Everest, seen from Gokyo Ri, a peak in the Himalayas, Nepal.

The Grand Canyon from the Grand Canyon Skywalk, Arizona

The view the Paris cityscape from Sacre Couer Basilica.