There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

Stunning wetlands ablaze with pink lotus flowers.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

The long underground cave's curiously shaped stalagmites have inspired many legends.

Caves full of Buddhist statues, incredible rock formations and a deserted lagoon.

A colorful kitschy temple and floating market off the beaten path.

Vintage furniture and art share space with all manner of collectibles at this quirky shop in Bangkok.

The true depths of these stunning Moroccan caves are unknown.

Vast stretch of tide-pools with a unique Moroccan charm.

Morocco's Argania trees are infested with nut-hungry goats.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

Over fifty whirling pools left by the glacial age.

An abandoned dollhouse factory.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Handsomely crafted representations of our round planet.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.