Take a few seconds to look at this abandoned, art-filled station as you pass by on the subway to Ueno.

The world's longest tunnel with an undersea section.

Ruins and statues dot the landscape of this tiny island rich with royal history.

A hub of information on tropical diseases and their treatments.

These wondrously illuminated caverns extend under the mountains of the Fukushima Prefecture.

Sulphuric gases inhabit a beautiful Japanese island.

This historic hydroelectric power plant in Japan has been preserved and is open to the public.

When this clock strikes a certain time, puppets showcase a story of life in Edo Japan.

Japan's largest collection of Western-style mansions in the port city of Kobe includes a recreation of Sherlock Holmes' 221B Baker Street quarters.

A small island with no monkeys but plenty of military ruins.

A remote and slightly overgrown park filled with replicas of world landmarks.

A dilapidated amusement park with a million-dollar view.

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

A quaint amusement park now sits, rusting and forgotten among the foliage.

A semi-abandoned replica of Prince Edward Island's Avonlea—in Japan.

Ever needed a chocolate-filled crepe in the wee hours of the morning?

A 59-ft. robot statue looks over the citizens of earthquake-ravaged Kobe.

An abandoned Art Deco hotel nestled on the side of a wooded mountain.

A sobering scientific reminder of the human damage caused by the advent of the nuclear age.

Elaborate series of tunnels where traces of mass suicide are still visible.

A mysterious set of tunnels carved in the hills of rural northern Kyushu.

Kawaii meets poisonous at this unique art gallery.

The cutest shrine in Kyoto is dedicated to bunnies.

This sawtooth mountain range still bears the strangely lovely marks of its history as a medieval quarry.