Mysterious 500-year-old tapestries depict a unicorn hunt.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A flooded Mexican cave that hides a river beneath the water.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Where commuters walk through remnants of an ancient Greek necropolis.

A church filled with the bones of hundreds of virgins martyrs—or so they say.