This one-time health resort was used by aristocrats around the world.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A 20th-century picture show in 3-D.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Real bones which are said to have belonged to a Polish dragon.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Op-art architecture designed for happiness.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Be(w)ar(e) the moat around this historic Czech castle.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A surreal statue honoring Prague's favorite literary son.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.