An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Massive stele returned to Ethiopia after 70 years in Rome.

Eritrea's futuristic gas station is a nod to Italy's fascist history.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

This monumental work of art symbolizes the coming together of a previously divided city.

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

This "floating railway" is one of the world's oldest monorail systems.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

Wooden pavers represent a 17th-century barrier that gave Wall Street its name.

Unrepaired walls from a 1920 anarchist bomb attack.

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

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

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

An Irish Memorial commemorating those who perished due to potato blight.

Yo, Adrian!

Believed to be the birthplace of the United States Marine Corps.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.