Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

The world's most important buildings shrunk to a tiny size.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Phil Mortillaro uses keys to bring art back to the Village.

A semi-scholarly approach to sex.

The most confusing clock in New York.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A dilapidated dock tells the story of Titanic's missed arrival.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

At 207 feet, one of the world's longest continuous escalators.

The United States Capitol's former columns still stand.

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

Elevated freight railway turned wildly successful urban park.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.