A monument celebrating the idea of reaching inaccessible places.

These azure waters were thought to lead to the Mayan Underworld.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Four-story concrete hotel never opened to customers.

The king of U.S. high points towers over every other peak on the continent.

This whimsical stacked cabin looks like something out of a children's book.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Considered by many to be one of the most dangerous highways in Alaska.

This popular fishing spot at the outflow of a 4.5-mile long hydroelectric tunnel sports a jetty literally made out of classic cars.

Siberian husky that delivered a life-saving antitoxin.

This abandoned mine offers a glimpse at what life was like for those who came to Alaska seeking Gold Rush riches.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

A modernist landscape of water and sci-fi concrete.

Austin’s local mountain isn’t really a mountain at all.

Free public park and gardens filled with peacocks and peahens.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.