A perfect turquoise lake colored with glacier dust.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

An Austrian house of bones filled with hundreds of intricately painted skulls.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

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

Baroque celebration of the end of the Great Plague of Vienna.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Tiny memorials honor individual victims of the Holocaust.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

Amsterdam's former hotspot for public executions and dissections.

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

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.