An underground city of salt.

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

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A statue honors the children who fought Nazis in Poland.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A museum in the childhood house of a medical pioneer.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Once the home of a hermetic monk, this cave now houses a small church.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.