The vast, legendary catacombs hold secrets much stranger than stacked bones.

Art and a pun, all in one.

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

A beautifully eclectic mix of architectural styles.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Museum preserving torture methods from the past.

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

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

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

The oldest surviving botanic garden in the United States.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

World War II bunker still standing on the New Jersey beach.