One of seven Jewish catacombs in Rome and one of only two open to the public.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

The underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A full-scale replica of a 1774 colonial settlement in Kentucky.

Unique tower has outlasted a takeover of the company.

Cell phone tower constructed entirely of wood.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A surrealist timepiece by the artist of melting clocks.

A visionary precursor to the Internet made of index cards.

A museum of carnival attractions where you are invited to ride the rides.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This massive library holds what was once the largest book collection in the world.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

This bridge was constructed from the rubble of the infamous Bastille.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Statue of death tucked in the University of Medicine courtyard.