Once America's longest-manned military fort, now an abandoned hulk.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

Approximately 300 million years ago, a massive coral reef existed in what is now the largest limestone cave in Japan.

The iconic castle that withstood a magnitude 6.2 earthquake has become a symbol of resilience.

Row through this enchanted narrow chasm whose stones are said to resemble dragon scales.

The largest volcanic caldera in Japan holds an entire city in its maw.

Steaming blood-red hot spring from hell.

Hanging over one of Japan’s “hidden valleys,” these vine bridges must be remade every three years.

As the aging humans of this Japanese village die off one local artisan is replacing them with eerie homonculi.

"The Dance of Fools" is Japan's largest dance festival.

Largest graveyard in all of Japan surrounds a famous mausoleum.

Be a ninja - or just act like one.

Hot springs monkey spa in the middle of Hell's Valley.

Nine healing baths available only to those who stay in this quaint town, said to have inspired 'Spirited Away.'

This historic castle is one of the oldest and most impressive in all of Japan.

This giant seated Bhudda of Healing dates to the 1780s.

Museum showcases Japanese sexuality and some amazing ocean views.

Fanatical collections of vintage toys, dolls, clothes, and objects.

This ancient shrine has been rebuilt every 20 years since the eighth century.

This pair of small sea rocks has been "wed" using rope and ancient Shinto tradition.

A bizarre assault of surreal art hiding in bushes and huts on a hill.

An ingenious solution to a tricky engineering problem, this spiraling bridge takes drivers for a dizzying spin.

The largest of its kind in Japan, this century-old wasabi farm is also known for its appearance in an Akira Kurosawa film.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.