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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Giant, friendly pelicans in Central London, the most unlikely of places.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

A centuries-old church stands as a testament to Boston's "father of architecture."

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The most confusing clock in New York.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The famous winding walk at Chartres is surrounded in mystery and myth.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

Golden Gate Park's historic collection of plants.

Eighty million natural history specimens call this gargantuan museum home.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Be(w)ar(e) the moat around this historic Czech castle.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Steadily reminding Czechia of its past.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.