This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

This fantastical house shaped like a seashell brings aquatic design to architecture.

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

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This small-town pizzeria won the Hollywood lottery.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.