The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Nikola Tesla's former home contains an homage hidden from plain sight.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Turkish adventurer antiques in the heart of the Grand Bazaar.

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

Architectural monsters are devouring this palace's every door and window.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

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

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

These spooky and unusual stone formations create an underworldly landscape.

An Italian hillside ghost town.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Science fiction's grandfather has a fittingly marvelous tomb.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.