These markers are used to determine the ground stability of the Strip.

A homage to the King at the hotel where he revived his career.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A museum dedicated to a Cold War era sausage.

Metro station with a claim to rock n' roll fame.

Tiny memorials honor individual victims of the Holocaust.

A restaurant and observation deck built in a unique broadcasting antenna.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A stone copper was sculpted on the wall of the Carlisle Cathedral to honor a local hero.

These formal gardens were designed to be admired from the vantage point of the castle.

An unassuming grey box sitting on San Francisco's Pier 17 is a "sky diary" of the coastal city's temperamental weather.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

This contorting sculpture is the tallest in San Francisco.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

A monumental cross hides in the trees in Golden Gate Park.

Only hotel where you can legally launder money.

Faceless white figures loom over the city from the rooftop.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.

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

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