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

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

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

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

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

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

One of Chile's most active volcanoes is riddled with beautiful caves.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

One of Ireland's most infamous prisons for rebels including men, women and children.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Historic medieval fortified city in southwest France.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The oldest operating pharmacy in the world features 800-year-old recipes.

Ancient ruins hidden underneath a modern luxury hotel.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The ruins of New Zealand's largest classical-style church.

A drowned river valley that was important to the Maori and European settlers.