More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

At 207 feet, one of the world's longest continuous escalators.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

These locks on North America’s oldest canal are named after a porcine rock formation.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

A flooded Mexican cave that hides a river beneath the water.

An exotic wildlife habitat right off The Strip.

Wayne Newton's sprawling estate is now open for visitors to catch a glimpse of his "heart and soul."

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The collection of 80+ pieces created between the years 1100 and 1500 is intended to be seen, heard, smelled, touched, and tasted.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

Cheap art and political theater in Vermont.

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

The first of Lancaster's "rural cemeteries."

The oldest farmer's market in America is so ancient it was approved by the King of England.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

This giant Massachusetts sycamore is said to hold the dubious distinction of being the "widest tree East of the Mississippi!"

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.