Eighty million natural history specimens call this gargantuan museum home.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Thousands of well-dressed mummies below a monastery.

The former atelier of Mario Cassisa is a treasure trove of paintings, sculptures, and artist books.

A unique work of automotive art calls this shopping center home.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

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

This bell stars in a tragic love tale and is said to make wishes come true.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Finally reunited, the three effigies now stand in a museum courtyard.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

It houses the remains of a 17th-century version of the Titanic.

This castle has links to Portugal’s founding and struggles for independence.

This giant sculpture made of trash is a critique of society's wastefulness.