These markers are used to determine the ground stability of the Strip.

A legendary tree towers within its own vibrant sanctuary.

A retrofuturistic art installation in the Pittsburgh Airport.

This historic house museum that celebrates one of the world's most influential social reformers is also one of the most haunted locations in Chicago.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Nothing says indulgence like a 1,500-pound chocolate castle.

The land is home to swimming ponies and a legendary 18th-century treasure.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

"Where the ducks walk on fish."

A tiny one-room church built after one man's prayer for healing was answered.

The hometown of movie legend, military officer and All-American guy next door, honors this great actor.

The "All-Seeing Eye of God" symbol on this library is a clue to one of the many former lives of this building.

An imposing pair of sphinxes stand guard outside this Egyptian Revival tomb.

A natural gas leak provides a flickering flame beneath a waterfall.

Belly up to the bar in Cowtown, don't forget to buy some boots.

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

Two small markers remember the Alamo's feline protectors.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

This massive oak tree has ties to the first native tribes of the region and the founders of Texas.