Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This national park is home to unique vegetation known as woodland savannah.

According to one story, this burial mound is made up of stones that represent the casualties of a major battle.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

Avoid gangster interaction while window-shopping.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

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

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

A terrific purveyor of natural history objects and curios.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

An overlooked memorial honoring the local Washington residents who died in World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Perhaps the most scandalous statue of America's first president.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This elaborate towering structure was once famed for its revolutionary height.