Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Watch butterflies take flight before you fly.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Giant marble phalluses on the sacred island of antiquity.

What once sat in the world’s spotlight is today a largely disused ghost complex.

Where commuters walk through remnants of an ancient Greek necropolis.

Gladiators once walked this ancient, subterranean passage.

Monasteries on rock pillars, once accessible only by frayed ropes.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

Dedicated to the lives lost during a fatal stampede in the Nyamiha Station.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

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.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Little Red Lighthouse under the George Washington Bridge.

A crumbling staircase in upper Manhattan is all that remains of one of the most important sites in sports history.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.