A 1,215-foot tunnel transports pedestrians beneath the River Thames.

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A gorgeous medieval library where the books are kept in chains.

For many years, the river that Julius Caeser led his army across into Italy was lost until re-identified.

A fictional Coupe DeVille built by hand and gifted to the Man in Black himself.

Home to drunken tower-climbing goats... seriously.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The juke joint where legendary soul artists ate, drank, and made merry.

Elvis's own personal tropical hideaway.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A technicolor place of worship for Elevationists.

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

The huge collection of paintings of the American West is one of Denver's best-kept secrets.

This sidewalk tribute honors Colorado's great culinary creation.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Neal Cassady may still have an open tab at one of Denver's oldest watering holes.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.