The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The "lovely red Vega" of the legendary record-settling pilot.

Every equinox this Maya pyramid puts on a spooky ancient light show.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

At 207 feet, one of the world's longest continuous escalators.

A former major munitions plant that has been converted into a sprawling art space.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

A private collection of massive steel monsters guarding a Texas pipe works.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.