The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Jesus' footprints and the first catacombs in the world.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

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

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.