This huge metal monument is slowly being stripped to its concrete skeleton.

Space-age monument to an early 20th-century uprising.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Once the most densely populated place in the world, this island is now a ghost town.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

This massive blockhead sculpture hides an entire library.

Minimalist modern art on a repurposed military base in rural Texas.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

This bridge is so steep it looks like a rollercoaster.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A Prada store in the West Texas desert that is never open for business.

This massive chapel in the middle of the Indonesian forest is both haunting and fowl.

Surreal riveted sea forts once protected the Kent shores from German attack.

An art museum with an eclectic design and a scandalous past.

The original "capsule building" is a masterpiece of Metabolist architecture.

The original goat tower, the one that started it all.