One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

Canada's subterranean Cold War museum has doubled as a movie set.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A beautifully eclectic mix of architectural styles.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

It's always summer at the beach inside this former airship hangar.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

This unique Renaissance castle was turned into a home for Nazi occultism.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This "floating railway" is one of the world's oldest monorail systems.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An intricate and amazing house built by architect Karl Junker.

"The most colorful grottoes of the world.

A fascinating insight into daily life in the Eastern Bloc.

When the rain falls, this drain system turns into a musical instrument.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

This classic restaurant features a gorgeous mirror-clad room.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.