This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Mysterious rocks that ring musically when struck.

Stroll through a wonderland of stupendous moss-covered trees.

Rising from the sea like a stone monster.

Enormous lake at the bottom of a unique cave system.

These fantastically named natural pools look like something out of a Scottish myth.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

Medical and zoological curiosities for sale.

Towering basalt columns, a creation of fire and ice.

A massive underwater sinkhole made famous by Jacques Cousteau.

New York's oldest magic store.

Elevated freight railway turned wildly successful urban park.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The rocks in this arid basin leave trails of movement behind them.

An eerie, derelict amusement park in Berlin.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

An emerald-green grotto just a short trip from Austin.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The biggest solar telescope in the world helps reveal the secrets of our sun.

In Tucson a giant metal snake helps pedestrians cross a busy highway.