Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

In the 19th century, this canal provided power to mills, machine shops, and other businesses in the area.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

This site honors the end of a 100-year boundary dispute between the United States and Mexico—all started by a river's shifting course.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

Some islands... they come, they go, especially on Lake Travis.

A serene temple with stunning stained glass hides in downtown Dallas.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

One of the most photographed locations in the entire city.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.

The only surviving fragment of the lost Narragansett Pier Casino.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

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