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

This imposing 20th-century castle was abandoned before it was ever completed.

The only things left in this abandoned Latvian graveyard are a mysterious stone and a ghost story.

A memorial to the beloved brown bear that served in the Polish army during World War II.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

This Minsk museum has cat coffee, cat chess, cat art, and even a cat "staff," which visitors are free to take home.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

Cathedral-like Victorian vaults are hidden within this iconic bridge.

The 18th-century inspiration behind Harry Potter's Sorting Hat.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

The burial place of 14 of the executed leaders of the Easter Rising.

A teddy bear sits on a chair watching the sunset from the mountaintop—just as the late Dan Clancy had done since childhood.

A massive Celtic cross secretly growing in an Irish forest.

A particularly disconcerting tribute to Irish martyrs.

The oldest licensed distillery in Ireland.

Wallabies live naturally on this Irish island.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

A leafy, peaceful oasis nestled in the heart of Glasgow's busy south side.

A mysterious ruin shrouded in more folklore than fact.

These semi-natural waterfalls hint at the park's Victorian-era industrial past.

An aptly-named street near the birthplace of the modern LGBT rights movement.

A tribute to the artist and activist who created the rainbow pride flag.