A crumbling hospital from the 1850s on Roosevelt Island.

A magical oasis in the middle of the Negev Desert.

Deep in the Negev Desert, the world's tallest solar tower looks like a sight straight out of science fiction.

Hidden beneath a washing machine in a fake kibbutz, this secret bullet factory has been preserved as a museum.

The only quarter of the Old City not dedicated to a major world religion.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The home of the Dead Sea Scrolls is an abstract modernist dream.

This amazing ancient cave was kept secret for seven years to protect it from the public.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

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

The "Seinfeld" diner.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

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

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

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

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

There are owls with glowing eyes in Herald Square.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A Manhattan office building is home to the world's largest chess board.