The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

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

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

When ecosystems collide in the arid Southwest.

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

A wall of chewing gum moonlights as collective art.

A giant Troll lurks under one of Seattle's oldest bridges.

This massive roadside mascot was the first version of the giant to illustrate his butt.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

Explore the History & Technology of Electronic Communication

A toweringly silly piece of modern art has been delighting locals since the 1980s.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Buying your medicine at this particular pharmacy is like taking a trip back in time.

Hand-made memorials and a wish-granting murderer lie within this seaside pauper's cemetery.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Museum dedicated to the terror regimes of Hungary.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A church of bones, decorated with 40,000 human skeletons.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Looming communist pillar with a Czech twist.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.