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

The middle finger of modernity.

Medieval torture techniques with a modern conscience.

Where Cusack's record store from the film "High Fidelity" was located.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

This surreptitious shop is only open five hours per week.

Forgotten and then destroyed by fire, this was once one of the largest saltwater swimming pools in the world.

Visible below the waves are memorials to the city's Gold Rush dead.

America's oldest Italian restaurant is a San Francisco institution.

A 140-year-old castle with underground caves hidden in San Francisco.

Honoring Italian greats from Joe DiMaggio to Rocky Marciano.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

“Live hard, ride fast, eat pizza” at this joint filled with Evel Knievel memorabilia.

The best Tiki bar in Las Vegas.

Here, cows that make vodka are treated like celebrities.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Once the largest winery in the world, this castle-like building now sits abandoned on the San Pablo/San Francisco Bay shore.

The largest drain hole in the world.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.