Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A daily replay of the experiment that proved the rotation of the Earth.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

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

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The first American department store, and home to the largest operating musical instrument in the world.

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.

Dr Barnes' $25 billion private collection of art and arboretum.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

A rare view of a preserved Victorian science museum.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

A failed piece of Orientalism has become the proud symbol of a community.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The oldest farmer's market in America is so ancient it was approved by the King of England.

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

The oldest surviving botanic garden in the United States.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Yo, Adrian!

World's first "penitentiary," meant to be humane, drove men insane.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

An Irish Memorial commemorating those who perished due to potato blight.