Inside this Krakow church, an explosion of psychedelic color.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

This elegant monument to those who fought against fascism is inspired by the shape of the poppy flower.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This 11th-century structure is one of the oldest churches in Romania.

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

A Baroque mansion with ties to legendary magicians and alchemists.

A diminutive statue that was inspired by the sculptor's own daughter.

This building has survived for more than a century and remains virtually untouched.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

These waste baskets play a few risque messages to discourage littering.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

Once a meeting point for great thinkers, and the midpoint of the country.

One of the newest mosques in a city filled with thousands.

These natural cliffs look like they are a part of an old castle complex.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This statue of the famed author, actor, and journalist is made entirely of screw-nuts.

Dedicated to a brave pooch who fought a tiger to save a young child.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.