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

This spooky statue sits outside a famous Prague theater.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

In one of the world's smallest countries, a royal's personal winery is open to the public.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

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

An architectural oddity hides in plain sight on this iconic London bridge.

A lone gunner's station is all that remains of a replica Spanish Fort in Florida.

A Circus legend leaves an unexpected endowment.

The collection of 80+ pieces created between the years 1100 and 1500 is intended to be seen, heard, smelled, touched, and tasted.

The only place for a truly presidential dram.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

This demon atop the Notre-Dame de Paris looks utterly bored.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

An ordinary pond with fish from out of this world.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Eighty million natural history specimens call this gargantuan museum home.

This luxury shopping lane has been protected by its own tiny police force for over a century.