Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The prototype for all Nazi concentration camps.

Dedicated to this region's early settlements and rich history of salt mining.

The world's oldest known salt mine.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

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

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Macabre astrological automaton clock dating to the late 1400s.

Enormous burial mounds of ancient emperors.

An ancient fortification lives on in this Chinese city.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

Copenhagen's celebrated theme park and gardens.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

New Zealand's epic shrine to all things puzzling.

Hundreds of bras, blowing in the wind.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Europe's official "zero-level," the equator of elevation.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.