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

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

A curious cave church carved into the face of a cliff.

Two distorted Romanesque columns hold aloft a mine cart in honor of laborers who died during WWII.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

A mythically themed self-built sculpture park.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Village situated on a narrow volcanic escarpment.

A Spanish town built into the cliffs.

Wonderland replication in progress by one persistent man.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

A huge cathedral single-handedly constructed by one eccentric monk.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

A submerged village appears when dam levels drop.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

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

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A miniature Corsican village built out of pebbles.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Ghosts of France's colonial past.

A beautiful and classically designed villa, with an hourly infestation of monsters.