In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

A restaurant and observation deck built in a unique broadcasting antenna.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

This mysterious and unique painting is filled with symbolism.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

A Jenga-style cylindrical tower of books that appears to go on forever.

This doorless 20th-century elevator doesn't stop or slow down.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

A statue honors the children who fought Nazis in Poland.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This artificial cave looks like something out of a fairytale.

Two stunning 17th-century libraries and a cabinet of curiosities.

The silly symbol for an underground protest group is now scattered around the city.

A collection of old neon signs from all over Poland line a secluded courtyard.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

A striking public sculpture representing the period of martial law in Communist Poland.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

A memorial to the murdered Jews of Kaunas.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

These crumbling Latvian forts make for some haunting seaside ruins.