The key to turning shifting dunes into the green oasis of Golden Gate Park.

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

Hear the quietest sound from across the dome.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

One of the world’s leading and most extensive archives on the Holocaust, the Nazi era, and genocide, this collection includes published and unpublished works, press cuttings, photographs, and eyewitness testimony.

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

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

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

One of the largest Native American shell middens stands 30 feet tall.

Built by the patriotic residents of Boonsboro in a single day.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

The oldest badlands in North America, Makoshika State Park takes it name from the Lakota words for broken land.