This ancient hydrological marvel is now the base of a modern outdoor cinema.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

HBO series' stage tucked away in a Greenpoint lot is the largest theatrical set of its kind in the United States.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

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

Nature and beauty amidst pollution and industrial wreckage.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

A long abandoned hospital building on the outskirts of NYC.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

The Vatican of the movie industry turned into an actual church.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

This classic red schoolhouse is said to have been where Mary and her little lamb went to school.

A house of courtship where the Jazz Age's most storied lovers got their start.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This miniature take on the Kremlin is one Dutch man's retirement project.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

This historic mini-suspension bridge was swept away once but is now here to stay.

This metal eagle one of the final remnants of a newspaper that wanted to keep Brooklyn to Brooklyn.

The violinist who played on as the Titanic sank is buried in this quiet English cemetery.

Warsaw's fantastically preserved gasworks...almost.

As one of the world's largest hydroelectric dams this plant took two countries to get built.