Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A bizarre house filled with an astounding array of collections.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

A fitting attraction for the corn capital of the world.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A cemetery housing wild west legends in South Dakota.

One man's ambition created this psychedelic log home.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

The former hotel where Tesla invented the radio.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

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

This abandoned subway station can still be seen on regular commuter trips.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.