Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

Berlin's old airport.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

This lovely pocket park is one of the most under appreciated in D.C.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

There’s a hidden military meme engraved on the World War II Memorial.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Home to items never before seen by the public.

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

Avoid gangster interaction while window-shopping.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A popular European tradition makes its way to the states on one of America's most famous bridges.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The "Seinfeld" diner.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.