A communal oasis on Lake Zurich.

One of the world's oldest olive trees, thought to be over 2,000 years old.

One of the most accessible undersea plane wrecks in the world.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

An underwater city for the dead.

A massive underwater sinkhole made famous by Jacques Cousteau.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

Each year melting snow turns these Austrian hiking trails into scuba zones.

This Latvian shot factory is still used twice a year to manufacture bullets the old-fashioned way.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Toy museum in a former tavern is the expression of one man's life pursuit of the aesthetic power of cartoon imagery.

This former lieutenant governor's home is brimming with curiosities.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

Get a taste of the Wild West and a glimpse into the gold rush in Goldfield's oldest continually-running business.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

A Welsh sheep farm provides daily (non-sheep) meals to red kites, producing dazzling displays of aerial acrobatics.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

Turns out you can see the world without ever leaving Maine.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.