The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

One of the most well-preserved temples of ancient Egypt.

Ancient Egyptian relief, claimed to depict an electrical light.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The site of the climactic scene from the classic horror film is now a historic landmark.

This memorial museum chronicles the apocalyptic destruction of the First World War.

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

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

An artist's cute bronze subway sculptures belie his violent artistic past.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

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.

A very classy 1920s-era bar right in Grand Central Station.

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.

Try not to get slimed in Tribeca.

Artists and musicians now rule over this former rail station.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.