A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The marshy karst plain has reclaimed this beautiful 17th-century church.

This marvelous array is one of the largest collections of mechanical instruments in Europe.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

Part of an abandoned19th-century fortress hides in plain sight inside a modern office building.

These bronze sculptures sow whimsy by hamming it up on a pedestrian mall.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

Modern megaliths form this work of cosmic, Celtic landscape art.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

A labyrinthine museum chronicling the history of African culture in Brazil.

This overgrown mountain village has been abandoned for nearly a century.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

The only surviving piece of Copenhagen's 16th-century defensive wall.

This colonial fort is an intriguing example of Renaissance military architecture.

After years of slow decline, a derelict Gothic castle is now being restored to life.

On special occasions, one of the world's tallest artificial waterfalls gushes down the side of this Chinese skyscraper.

The legendary bathing site of a Moorish queen is actually part of a Roman fish farm.

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

The idyllic colonial home of the artist behind the famous portraits of George Washington and Thomas Jefferson.

This beautiful waterfall is not easy to reach, but offers a stunning view of the pristine green valley.

An abandoned amusement park hints at the twisted history of the Newfoundland Railway.

This remote fort on the Yukon River is a vestige of the wild Alaska gold rush.

The final resting place of a controversial man who was instrumental in plucking the banjo from obscurity.