The quarry was abandoned over 100 years ago, after a massive ammunition explosion ended in tragedy.

Why have you never heard of the second most popular tourist site in New York?

The ornate structure is part of a building boasting more marble than the Vatican.

A 200-year-old collection of oddities and medical paraphernalia.

The grave of Mary Nasson is shrouded by witchy legends.

Historical figures from New York City's Catholic community reside in Midtown.

One man's swirling six-acre monument of stone.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

A mysterious echo seems to defy the laws of acoustics.

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