This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

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

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

Thousands of well-dressed mummies below a monastery.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

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

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The pockmarks across the building's facade are remnants of the Blitz.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A hundred copies of Antony Gormley's naked body stare out across the water.