The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

A lake formed in the basin of a massive impact crater takes the shape of an unbroken ring when viewed from above.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

An architecturally-focused antique shop.

A community of collapsing homes more than a mile out from the Florida coast.

20,000 pieces in a Frank Gehry-designed building.

This lab's maddening silence is good for business but bad for sanity.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

Three buildings constructed of over 25,000 multicolored glass bottles.

Home with Gothic windows featured in a famous painting.

Home to drunken tower-climbing goats... seriously.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

The home of 1.5 million wood letters for printing is still a functioning workshop.

World's second largest particle accelerator, where nature reveals its secrets.

House built with over 60,000 glass bottles.

A scenic overlook of a pit mine hundreds of meters deep filled with blue water.

A neutrino detector built into the largest man-made underground cavity in the world.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Little island known for its massive beachfront "flowerpot" pillars.

Two adjoining collections of 19th-20th century physics apparatuses and instruments.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

One of the oldest living oak trees in the Southeast.