The world's largest private aircraft collection.

One of the few institutions in the United States devoted to the art of decorative bird carving.

The world's largest rotating world.

The ruins of a medieval monastery named after a type of tree.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Three columns of volcanic rock shoot out of the ocean.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

One of the oldest family businesses in Reykjavík serves lamb-based hot dogs.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

A building so large that it has its own weather.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

Former villa and estate of James Deering developed to preserve native tropical forests.

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

A grand entrance to one of the world's smallest Chinatowns.

This ornate church designed by a self-taught architect is an eclectic masterpiece in the heart of Central Mexico.

This grand yet little-visited tomb seems almost carved into the hill it sits on.

The spectacular subterranean collection includes dazzling minerals, including a piece of "kryptonite."