Its columns were all carved from the same white oak tree.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Every year, the colorful murals of Montreal get a complete makeover.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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

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

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

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

Yo, Adrian!

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

A layered tribute to the work of mosaicist Isaiah Zagar.

The world’s first penitentiary, meant to be humane, drove men insane.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The most confusing clock in New York.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Elevated freight railway turned wildly successful urban park.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This giant disembodied horse head seems to balance impossibly on its nose.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

A unusual sanctuary for abused and exotic animals in South Jersey.