The largest drain hole in the world.

The rusting remains of the largest assembled WWII fleet on the West Coast.

An oil baron's wild paradise and the winner of an ill-fated air race.

These massive mitts are made of 30 tons of devotional bronze.

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

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

I Street Bridge is the heaviest swinging center bridge in the United States.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

An acoustic anomaly with a mysterious cause.

Final resting place of Geronimo, Quanah Parker, and the first atomic gun ever fired.

American bison herd descending directly from a Bronx Zoo breeding program that saved the species from extinction.

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

Every president in history is immortalized in bronze in downtown Rapid City.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.