This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

For more than 170 years, this family-run bakery has been serving Berlin’s best Baumkuchen, or “tree cake.”

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

A miniature city, once ruled by the Queen of the Netherlands.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

A market built atop boats is one of the few floating holiday markets in Europe.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Amsterdam's former hotspot for public executions and dissections.

The world's first interactive human body museum also serves as a chair for a giant orange man.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The attic of a four-century-old canal house hides a clandestine church.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

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

Museum preserving torture methods from the past.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.