The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Yo, Adrian!

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A rare view of a preserved Victorian science museum.

A layered tribute to the work of mosaicist Isaiah Zagar.

A multi-storied adobe complex has been inhabited for more than a thousand years.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

When ecosystems collide in the arid Southwest.

Banksy's image of a naked man dangling from the window of a sex health clinic.

Famously misunderstood wonder of the ancient world

A museum marks and documents the site of the Titanic's launch.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.