This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This abandoned boat was left in place thanks to its rotting beauty.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Colorful sand dunes create a unique attraction in this part of Utah's red-rock country.

A sharp bend in a dramatic river canyon cut through red rocks.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The glacier tucked within a New Zealand rainforest.

This charming stone church on the shore of Lake Tekapo is an icon in astrophotography.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

This Taiwanese promontory is covered in otherworldly hoodoo formations.

The tangled roots of a giant banyan tree have fully reclaimed the ruins of this abandoned warehouse.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

Designed by Gustave Eiffel before his famed tower.

Historic medieval fortified city in southwest France.