A wealthy aristocratic family built this Disney-worthy, fairy-tale castle.

A set of outdoor stairs named in honor of a famous Austrian artist.

The first modernist church in Europe.

An ornate private entrance to the Vienna subway built specifically for the emperor.

Apartment complexes built into huge repurposed natural gas tanks.

One of the best collections of wax anatomical models in the world.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

This park built on a former fortress has a reputation for romance.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

This curious sculpture represents the perseverance needed to take to the skies.

Thousands of graves lurk below the surface of this park.

You'll find just about anything in this funky Tbilisi flea market.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

This monumental work of art symbolizes the coming together of a previously divided city.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A hundred-year-old museum filled with giant physics toys and experiments designed by grad students.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

Organisms normally seen under a microscope decorate this church.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

The first monument in Estonia that was made by an Estonian sculptor.

This church also serves as a lighthouse complete with a beacon.