Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Half of a waterfall goes into the river while the other half seems to disappear.

The world's largest otter started his life as a high school shop project.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

Famous for its bio-luminescent inhabitants, known as "dismalites."

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Underneath this water pump, Annie Sullivan helped Keller speak her first words.

You'll need cowboy boots to trek to this old-fashioned saloon nestled in a giant natural cave.

A local prank turned town icon.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

These five houses were built for the 1933 Chicago World’s Fair.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Elevated freight railway turned wildly successful urban park.

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

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

This sculpture brings optical illusion to the roadway.