A priceless work of art created by the saint's own blood sister hangs in a San Antonio basilica.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

The 40-foot-tall votive candle is the largest of its kind.

A 131-year-old wunderkammer of Texas history.

Three hundred years of preserved Spanish colonial history in San Antonio.

The summer home of the largest colony of bats in the world.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The humble field where the first Major League Baseball game was played.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

The oldest surviving botanic garden in the United States.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Where America's first doomsday cult awaited the end of the world.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

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

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.