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

This museum inside Amsterdam's largest cemetery explores how people deal with death.

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.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A floating cat sanctuary on an Amsterdam canal.

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

A curious collection dedicated to human and animal anatomy and pathology.

Cat art as far as the eye can see.

An abandoned swimming pool decays on the outskirts of Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The most visited, and possibly most controversial, museum in Germany.

Concerts, art, offices, and a café in what used to be Berlin's first crematorium.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

The "Prussian Versailles" that is as glorious today as when it was built.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.