The smallest post office in the United States is no bigger than a broom closet.

The history of the traveling carnival is remembered by this sprawling collection of vintage wagons, games, and rides.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The world's largest private aircraft collection.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

A self-explanatory attraction allows fans to respectfully remember and honor a comedy legend.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A passage grave used in neolithic rituals.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

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

Venice's "Island of the Mad."

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

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

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

An astounding collection of medical specimens, including bits of President Lincoln.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.