The medieval network of canals hidden underneath the city is opened to explorers each year.

Eighty million natural history specimens call this gargantuan museum home.

One part local history, 99 parts gruesome haunted house.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

The remnants of this unusual bridge await an uncertain fate.

A little piece of Oxford's overlooked industrial heritage.

A hidden plaque is the only reminder of the lost palace where two storied English kings were born.

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

Used as an example in one of the first dictionary entries for "museum" in 1706.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

"Only the devil could play golf here."

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The longest burning light bulb in the world.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Housed in a memorial lighthouse, this museum relays the history of surfing, beginning with the antics of royal Hawaiian teenagers.

A humble garage, world-famous for being the epicenter of a technology revolution.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

San Francisco's newly reopened hands-on science museum.

A living time capsule of the 1960s Richardson Bay water-front.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.