A spectacular cave and a beguiling lake.

Ancient Greek oracle of the dead.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Rising from the sea like a stone monster.

A no-frills cinephile haven known for showing offbeat, underseen films.

This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

As telephones become more essential and less stylish one historic Brooklyn building remembers the days when they were a grand celebration of communication.

New York's oldest concrete structure is being preserved thanks to the gentrification of Whole Foods.

The only surviving sidewalk clock in Brooklyn.

A group dedicated to promoting boating, kayaking and environmental education programs.

A hidden architectural treasure in New York's Brooklyn.

Headquarters of the world's fourth largest Hasidic sect and the first of many "770s" around the world.

The Underground Railroad passed right through this historic Brooklyn Heights church.

Brooklyn vintners creating world-class wine in a city not known for its vineyards.

A Collegiate Gothic quadrangle that surrounds an 18th century secondary school whose financing came from the likes of Alexander Hamilton and Aaron Burr, among others.

Brooklyn's Barkaloo Cemetery is the resting place of a scant two bodies.

The home of aviation trailblazers, in a remote corner of the big city.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Nature and beauty amidst pollution and industrial wreckage.

Four cars from the old system were once on display, but were removed in 2014.

Waterway populated with abandoned projects, including a submarine.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

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