This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

The ghostly remains of what was once the world's richest copper mine.

Gorgeous cave resemble a winter wonderland.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

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

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

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

An abandoned warehouse turned art sanctuary in New Orleans.

The only home of the famous French impressionist painter open to the public is now a museum and bed and breakfast.

The tallest monument in a historic New Orleans cemetery was prompted by romance and dash of pettiness.

Shop for books in the New Orleans house where William Faulkner once lived.

An abandoned underground bunker not far from downtown New Orleans.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

The beautiful, fruit-covered facade hints at this building's former life.

Before becoming a public park, this spot was a shell midden, a fort, and an amusement park.

This strange example of the Egyptian Revival architecture trend now holds Mardi Gras floats.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

This Birdsill Holly fire hydrant is the remnant of a very different type of hydration innovation.

A hurricane-stricken oak tree has been reborn as a beautiful chainsaw artwork.

A haunting, yet lovingly hand-hewn potters' field full of graves that flood with each heavy rain.

A prime example of New Orleans' unique architecture these early 20th century homes were built to look like steamboats.