This one-time health resort was used by aristocrats around the world.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A miniature train-ride through Slovenia's largest cave system.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Christ's blood preserved in a Belgian town.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This rustic old building is said to be the most photographed barn in America.

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

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

The largest island on the great salt lake is home to curious creatures and strange stories.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

The highest bridge in America was built for an almost unnervingly small amount of money.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.