Highly spherical boulders on the shores of New Zealand.

New Zealand's only inland salt lake goes through a constant cycle of filling, evaporating, and refilling.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

One of the world's steepest streets seems to have houses sliding down it.

Three rooms of bones, curios, and one artist's collection of natural artifacts create this intriguing museum.

Known for the tunnel that leads visitors to the water.

This quirky collection is an interactive exhibit crammed with creative contraptions and tinkered-with toys.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.

An eerily charming collection of salvaged buildings and curios grown out of a family scrap business.

Museum of Fijian history, including its former tradition of cannibalism.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

This once-private estate is now a dreamy, meditative garden that's open to the public.

The attic and basement house two museums stuffed with oddities like swallowed spoon handles and a shrunken head.

The remains of what was once the world's steepest passenger funicular.

This abandoned factory on the Hudson River once churned out a million bricks a week.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Reforestation in action is the main attraction in this abandoned quarry.

100 massive sculptures in the Hudson River Valley.

Abandoned rock quarry now a haven for mountain bikers and hikers.

For a buck, students can snag freshly picked apples grown in the university orchards.

These expertly crafted, scientifically accurate glass sea creatures were once an international phenomenon.