This was once the largest city in Kazakhstan, and a major stop on the Silk Road.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

A sober museum housed in the original administrative building of one of Stalin's largest gulags.

Today this former Nazi concentration camp stands as a poignant memorial to the victims of fascism, and a warning from history.

A statue honors the children who fought Nazis in Poland.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

An eerie reminder to the horrors of World War II.

This Japanese national treasure was originally built in 593.

Peace Park and the Atomic Bomb Dome.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This snug medieval lane is one of the narrowest streets in the world.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Cathedral carved out of salt, located a mile below the Earth's surface.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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