Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

The world's first invisible city square is an homage to a man who pushed the boundaries of art.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

Museum deep in the catacombs of St. Michael the Archangel Church is explored by touch, sound, and smell.

This Gothic church was wheeled in its entirety to a new location a half a mile away.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An enormous and lavish Gothic church in Czechia.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

The mystery of the Putim Ossuary involves a tricorn hat.

These 17th-century mummies are no longer naturally preserved, but remain on display today.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Bohemian paradise covered in majestic forests.

Europe's second largest ossuary wasn't discovered until 2001.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Annual technopop celebration of peace and love.

An IT-specialist-turned-farmer reintroduces an Austrian food tradition while promoting snails as a sustainable "future food" option.

An ornate private entrance to the Vienna subway built specifically for the emperor.

The second-highest train station in Europe.

Though it may look like a businessman's lost luggage, this case suspended under a highway bridge is actually a contemporary art installation.

Created by a pair of artists, this former hotel was designed to provide a minimum of everything including comfort.

Artworks by loners, prisoners and the criminally insane.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

World's largest permanent maze made of 18,000 conifers.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.