The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The home, museum, and death site of Kodak's influential founder.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

This turn of the century masterpiece has a mysterious goaty interloper.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Northern Ireland's Brobdingnagian stepping stones.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Stay in a room with a view... of the bottom of the ocean.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Adherence to strict Jewish laws is required to enter this ultra-conservative New York village.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A beautiful geyser under environmental threat.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.