Tourists often confuse this beautifully ornate former cigarette factory for a mosque.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

When the rain falls, this drain system turns into a musical instrument.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

The bridge that cost Germany a World Heritage Site.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

The monument honors the first (and for a long time, only) African-born philosopher to teach at a German university.

A vast Communist-era exhibition space in the Bulgarian capital.

This building has two facades of clashing architectural designs.

A collection of art from Bulgaria's time as a communist state.

"Unity, Creativity, Beauty."

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

A striking symbol of the Bulgarian capital.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Rock carving created 1,300 years ago 75 feet off the ground.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.