A collection of huge Pre-Colombian structures in Alabama.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

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

One part local history, 99 parts gruesome haunted house.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

One of the world's longest murals depicts the history of diversity in Los Angeles.

Church and home-museum of a 1920s female revivalist preacher with a very sordid past.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This glamorous old building is said to have inspired the Tower of Terror.

Where the leftovers of love affairs can live on forever.

The programmatic glory of LA's giant whiskey barrel building has become an upscale reminder of the city's kitschy roadside past.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One man's homage to the sun continues to grow like a glass fractal.

Resting place of Hollywood's immortals is also site of summer film screenings.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

An ancient neolithic tomb that only sees the sun twice a year.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The ancient tomb acts as a calendar that keeps perfect time.

Europe's second largest ossuary wasn't discovered until 2001.

Macabre astrological automaton clock dating to the late 1400s.