This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The seamy, underground secrets of Portland's criminal past.

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

The oldest landmark of Toronto is a testament to shifting sands.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

A heavenly experience, right here on Terra Firma.

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A trash dump made beautiful by nature's power.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A walk through the historic city center, under the streets of Seattle.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A giant Troll lurks under one of Seattle's oldest bridges.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

A winding path built in secret on the edge of the continent.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Olfactory delights in San Francisco's Botanical Gardens.

Beach instrument turned bed and breakfast.