The perfectly preserved underground rooms where Churchill plotted the war against Germany.

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

The “American Gothic" artist's largest works hang in an Iowa State University library.

This simple home was the beginning of a long journey for the iconic Western film star.

Eight feet in diameter and more than 24 feet around.

The oldest university museum west of the Mississippi retains its 19th century feel.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

A fearsome dragon clings to a corner of Munich's city hall.

Living trees form the structure of an open-air palace.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Ruins battered by centuries of war and disaster offer a wondrous glimpse of medieval Ireland.

A hugely vast Irish landscape of barren rock that stretches for miles.

This single room has survived the centuries with almost no deterioration.