An abandoned underground bathroom is now a space for public art.

The largest brick bridge in the world.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Twisted buildings adorn the banks of the Rhine river.

A strange rock formation with numerous legends trying to explain it.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This historic stone bridge has an entire neighborhood clinging to its sides.

"The most colorful grottoes of the world.

An intricate and amazing house built by architect Karl Junker.

This "floating railway" is one of the world's oldest monorail systems.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A silly medieval mural preserved on the side of a Viennese house.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This cubist Vienna church building looks like some sort of alien stonehenge.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.