This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

A semi-scholarly approach to sex.

60 feet of towering steel balances gracefully.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

An Italian restaurant became a rock-and-roll hangout and the lair of the "Hollywood vampires."

A larger-than-life monument to the overlooked women who braved Western expansion and broke down societal barriers.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

Millions of dollars worth of sculpture decorate this Iowa city center.

Step back in time while shopping inside this local store.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

Backwards hour and minute hands and a timing mechanism that fluctuates with the temperature led to this clock tower's local nickname.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Turkish adventurer antiques in the heart of the Grand Bazaar.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."