Mysterious 500-year-old tapestries depict a unicorn hunt.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Become a prohibition rebel.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A crumbling hospital from the 1850s on Roosevelt Island.

An exquisite panometer representing Dresden as it was from 1695 to 1760.

A statue beloved by—and named by—the local townsfolk it represents.

A Nazi concentration camp and Anne Frank's place of death.

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A 1:2 billion-scale solar system leads visitors into this German university town.

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.

One of the oldest student jails in Germany.

The man who gave his name to magnetic measurement is buried in the city where he did his best work.

It commemorates one of the world's earliest telegraphs.

Renowned mathematician and physicist Carl Friedrich Gauss once worked at this observatory.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.

This historic stone bridge has an entire neighborhood clinging to its sides.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."