Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

It's good luck to be mocked by this monkey.

Beloved children's TV characters freckle the German city's streets.

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

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

In the 1940s, Italian architect Mario Cavallè built a dozen of these round homes in northern Milan.

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

A Serbian church lit by chandeliers made of weapons.

A pair of connected skyscrapers form this symbolic gateway.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

With over 10,000 lights, this engineering marvel lights up the city after dark.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

Huge stairway leads to this massive gallery.

See what remains of a once grand ancient Roman circus.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

This concrete church spent a period of its history as a World War II bunker.

This strange sculpture depicts a giant nightmare hare crushing a man to death beneath its colossal bulk.

Ancient catacombs form the foundation for this Rococo orgy of a church.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The stunning interior of this Gothic church is covered in ornate gold details.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.