A Gothic-style abode built to accommodate the church's three resident peacocks.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The mysterious image is believed to show Edward Hyde, 3rd Earl of Clarendon, in a beautiful blue dress.

Unique antiquarian shop specializing in globes, maps, and prints.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

The fifth-longest natural arch in the world, and the longest outside China.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

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

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Dig for your own trilobites in this goldmine of invertebrates.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The plague quarantine island home to the alleged "Vampire of Venice."

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.