The ancient tomb acts as a calendar that keeps perfect time.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

A stone wall that mysteriously moved three feet from its foundation.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Avoid gangster interaction while window-shopping.

An artist's cute bronze subway sculptures belie his violent artistic past.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

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

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

An ancient burial ground believed to have been used for ritual sacrifice.

A large camera obscura, constructed entirely from digitally fabricated components.

An unrealized dream to wirelessly electrify the entire Earth.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.