This museum inside a museum tells the story of London's timepieces.

Home to some of the oldest hominid fossils ever found.

Largest cave system in Africa.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The Boston square dedicated to the dark poet who was born nearby.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Abandoned power station once home to a squatter community, now being developed into an arts center.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A 220-foot deep watery drop-off, filled with marine life.

A son-and-daughter meat market, hawked by mom and dad.

An collection of Chinese propaganda posters from 1949 to 1979.

Self-mutilation in the name of beauty.

Singapore's landscaping project is home to 18 incredible Supertrees.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Postal archives over 150 years old offer a window into Singapore's culture and tradition.

30 years worth of pressed-tin, bakalite, and characters both loved and forgotten.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

An enormous, 30-story-deep hole in the middle of Guatemala City.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.