An obelisk commemorating Lincoln's role in connecting the coasts.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

This once rural mansion now sits in the heart of the city.

A brick-paved former section of the historic coast-to-coast highway.

This little gem of a museum is a hidden jewel filled with prehistoric treasures.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

Four ionic columns from the Treasury Department building ended up in a park in Nebraska.

The abandoned remnants of a little sanctuary for world peace that fell into disrepair.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Yup, that's where the name came from.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

The warmest cave in the Ozarks features two seemingly bottomless lakes.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

A large stone map of Arkansas awaits visitors to its highest point.

The largest public collection of roses in the United States.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

After the parade, students throw their beads on the tree hoping for good luck on exams.

A little piece of Paris in the sultry south of the U.S.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This Garden District mansion was built to be bigger and grander than its original owner's former partner turned rival.

Come for the 14-foot-long taxidermy alligator. Stay for the mini costumed gators shooting pool.