Coast along one of Japan’s mountain railways for coveted views of magnificent hydrangeas.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A moody and picturesque riverside ruin overgrown with vegetation.

Zambia's smallest national park is home to one of the world's largest annual mammal migrations.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.

This network of narrow, medieval passages has the most delightful name.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

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

This hidden workshop is filled with molds of France's most iconic sculptures.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

The bizarre headgear looks like it was made for a fool, not a king.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

Black cat statues guard this temple-like Egyptian revival factory.

The unbelievably opulent home built for an infamous newspaperman.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

This fairytale-like structure is the last turf church ever constructed in Iceland.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

A dreamy mausoleum honors Persia's most famous poet.

The abandoned summer estate of the former Greek Royal Family.