One of Philadelphia's largest murals resides hidden under this bridge.

Alexander Hamilton’s creation caused quite a bit of controversy.

This beloved marketplace mascot poops money and grants good luck.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

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

Yo, Adrian!

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

3D war panorama in Damascus built with help from North Korea.

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

Amid the rubble of Aleppo's Old Quarter, part of a historic market has been restored and re-opened.

One of the oldest and largest castles in the world.

Mysterious lost empire of the Silk Road.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

Ruins of the Crusaders' headquarters.

A gallery of underwater art that can be visited by man and fish alike.

This historic hiding place, often used by people escaping slavery, is a testament to a heroic struggle for freedom.

Tours drive right past this military burial ground to get the the Shirley Heights lookout.

An imposing statue of the first prime minister of Antigua and Barbuda stands in the middle of a traffic intersection.

A series of magical limestone formations along the coastline of the country island of Antigua.

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

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.