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

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

A 12th-century fortress containing some of Berlin's oldest buildings.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

This slender three-story building has also had several famous residents.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

Red frames showcase remnants of one of New York's original subway stations.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

Hiroshima survivor on Riverside Drive.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The most confusing clock in New York.

There must be a pun in this haystack somewhere...

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

The former hotel where Tesla invented the radio.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

Avoid gangster interaction while window-shopping.

Cryptic messages embedded in the New York City sidewalk.

New York City's only preserved family home from the 19th century.