The glowing blue Nymphaeum of Emperor Tiberius.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

A terrific purveyor of natural history objects and curios.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Avoid gangster interaction while window-shopping.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

The oldest Methodist church in the United States has been spreading the good news for over two centuries.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The middle finger of modernity.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

This classic restaurant features a gorgeous mirror-clad room.

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

A stately palace has been converted into the world's largest cannabis museum.

Turntable anonymously received orphans, alms, and groceries.

King Ludwig I's collection of beautiful women.