Extravagant mosque honors modern Islam.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

A geological bull's-eye visible from outer space.

Erosion and time have created a naturally-formed water park.

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

An abandoned bait shop with a front lot filled with storage boxes.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Beach instrument turned bed and breakfast.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

A gargantuan crystal kingdom.

Roam the cradle of the Cuban Revolution with life-sized dinosaurs.

Cavernous opening completely encased in Karst limestone.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

Extraordinary sculpture garden created by an eccentric English poet.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The fossilized remains of ancient California redwoods.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

The highest monastery in the world operates a tiny guesthouse with doors open to all.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

A wild Hollywood resort thwarted by mosquitoes.

Hotel designed around a 16th century Mexican bullring.

A giant Jesus statue watches over the city of Saltillo from the top of a mountain where it has been commandeered by vandals.