This historic hotel invented the chocolate brownie.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A geological mystery on Camelback Mountain.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Elvis's own personal tropical hideaway.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

Elevated freight railway turned wildly successful urban park.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Its history includes dinosaur fossils, cattle rustlers, Georgia O'Keeffe, and a mythical giant rattlesnake named Vivaron.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

The menacing creature had a tremendous influence on the local culture before being exposed as a hoax.

Built in 1933, this unique ballroom is nicknamed the "floating dance floor."

A winged-helmed, sword-brandishing tribute to German Americans.

The watery grave of an impractical idea.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

A jaw-dropping brutalist space church seems to have crash-landed in the middle of America.

Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

A stone face watches over the river.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

The Midwest's reigning king of surplus stores is full of nothing you need and everything you want.