A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Rebuilt remains of a temple to Roman god Mithras.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

An unusual round church in London with a Templar past.

This South London cemetery holds the remains of more than 15,000 people.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

King Ludwig I's collection of beautiful women.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

A stairway to heaven, or to nowhere at all.

An out-of-place slice of France, smack in the middle of Shanghai.

An collection of Chinese propaganda posters from 1949 to 1979.

This sensational Chinese temple walks visitors through the 76 weird departments of the afterlife.

This ancient Chinese observatory still contains early astronomy technology.

A progressive LGBTQ hub offers dancing, HIV testing, art, and more.

Ming Dynasty necropolis raided during the Cultural Revolution.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

A quiet marker in memory of local men and women lost in WWI.

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.