An early-19th-century hotel with a past that is steeped in the Civil War.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

Bootleggers ran booze beneath this building before (and after) Route 66 appeared beside it.

The world-record holder for the longest bridge stretching continuously over water.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

The words of the neighborhood's most famous poets adorn four concrete walls.

The bones of two medieval royal lions were discovered at the historic fortress.

The walls and streets of the ancient city are peppered with penises.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A living memorial to the trees London lost during the Great Storm of 1987.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The remnants of a creative early method of wildfire prevention.

The blinking light atop the iconic landmark has been sending secret messages for decades.

A historic blockhouse and trading post give a glimpse into the early colonial history of South Carolina.

The building was originally a gas station built to resemble a Japanese tea house.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

The wooden airship was the largest flying boat ever built.