An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A Zoroastrian funerary tower where excarnation rituals are carried out is threatened by the area's dwindling vulture population.

World's most expensive home.

The West's first incursion into the Afghan world lies buried beneath a military base.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

The 25th President's marble casket can be visited in this classical Ohio tomb.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.

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

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

Visit the monolithic tomb of America's most famous general.

You must take the A train... to the last active cemetery in Manhattan.

Little Red Lighthouse under the George Washington Bridge.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

The highest point on the island known for buildings that touch the sky.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

A very classy 1920s-era bar right in Grand Central Station.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A bit of retro transportation flair preserved in the world's largest department store.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

There must be a pun in this haystack somewhere...