An alchemist's "magic door" stands in the middle of a Roman park.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The anatomical-pathological collection of a man who changed surgery.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

An emporium for the weird, creepy, rare, and just plain gross.

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

Ruins of a German Castle on top of a towering stone pillar.

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

Hollowed out cedar log tubs set in an ancient towering forest.

The oldest stone house in Paris was built by its most famous alchemist.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

These fantastically named natural pools look like something out of a Scottish myth.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Thousands of well-dressed mummies below a monastery.

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

Elevated freight railway turned wildly successful urban park.

The United States Capitol's former columns still stand.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Abandoned railway line circling the city of Paris.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This lab's maddening silence is good for business but bad for sanity.

Beyond being incredibly fun, not much can be said about the Hole with certitude.