The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

An experimental, automotive replica of Stonehenge.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

A deserted hodgepodge of experimental structures designed by nearby university students.

A hotel and restaurant serving as the mecca of kitsch.

An alley covered with 20 years of bubble gum.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Death rituals and sacrifice inside a Peruvian megalith.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

An unexpected desert oasis in South America.

The Uros people live on floating reed islands in lake Titicaca.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

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

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

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