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

The longest navigable underground river in the United States is home to countless blind and albino animals.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

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

As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

Every winter, dozens of otherworldly ice structures sprout up from a rigged up artesian well.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

A lovely hidden waterfall right off the highway is well worth a stop.

This pebble beach is so beautiful that taking its rocks is against the law.

This cave holds a surprisingly colorful variety of geological oddities.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A bizarre house filled with an astounding array of collections.

This former fire tower is now a rustic observatory that offers amazing views of eagles, hawks, and the Appalachian Mountains.

Home of a 28-foot tall stalagmite known as the War Club.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

This monument is dedicated to those lost on June 6, 1944, in the town with that day’s highest per-capita casualty rate.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

Hundreds of skulls and bones at the largest skeleton museum in the country.

A trek through the solar system here on earth.