This sacred enclave was once considered the religious center of Eastern Polynesia.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

This unusual structure may be on its way to becoming a cultural landmark in Toronto.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

This sculpture forces visitors to confront their relationship with space.

This former coal gasification plant found a curious second life as a popular public park.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A giant Troll lurks under one of Seattle's oldest bridges.

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

Yo, Adrian!

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

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

The only subway station in the city that still makes use of gap fillers.

What happens here stays here – unless it affects the whole world.

Join in a Seance at the Swedenborgian Church.

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

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

One of only two commuter aerial tramways in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.