Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

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

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

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

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

The solemn exterior conceals an opulent interior of this 17th century church.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

This vast collection of smoking pipes from across the world spans centuries.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

English antique dealers with a taste for the unusual.

This 1920s Dutch barge is now a floating bookstore.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.