This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Legend says this sacred tree was a gift from goddess Athena.

An ancient Greek monument and a Byzantine church coexist inside this cave.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

A sharp sculpture made of thousands of pieces of jagged glass.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

This ancient market is often referred to as the oldest shopping mall in the world.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

The most confusing clock in New York.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A bit of retro transportation flair preserved in the world's largest department store.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

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

One of only two commuter aerial tramways in the United States.

Read a book next to a Midtown waterfall.

Elevated freight railway turned wildly successful urban park.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

Bad farming practices caused this unnatural natural wonder.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.