World's largest working waterwheel has been around for over 150 years.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

A prison tower–like edifice honoring a beloved local benefactor.

A 150-year-old steam locomotive crosses the southern half of the island daily.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

Wander around the extensive remains of this 12th-century medieval church.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

Aside from denoting a public square or market, this medieval structure was also a sign of a town's prosperity.

A small island dotted with old, historic Finnish buildings.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The reconstruction of this prominent building fulfilled a long-written command.

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

A black cat protests the City Guild in Riga's Old Town.

3,000 market stands in five former Zeppelin hangars.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.