Southern Italy's spinning top village.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The sunlight passing through the opening of this huge cave system creates a magical effect.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

Rusted and decayed, this former mining site is a portal to the past.

Giant granite rocks standing end-to-end like a train of circus elephants.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This groundbreaking 16th-century map is known as "America's birth certificate."

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The only mill in the state that features a covered bridge.

This 1854 courthouse along the Mississippi River has a storied history.

This former Union fort commands a fine view of downtown Cape Girardeau and the Mississippi River.

The iconic remains of the original Academic Hall that burned down in 1892.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.

The world's largest reflecting pool is just two centimeters deep.

Inspired by the more famous Scrovegni Chapel, Cappella di San Giovanni contains several amazing frescoes.

Constructed during the 1960s, this bridge is still the highest in Italy.

There once was a man named Lear / Who found limericks so dear / His final resting space / Is an unusual place / Most people don’t know he’s here.

This medieval castle was reconstructed by Carlo Scarpa.