This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

World's smallest skyscraper, the product of a remarkable con.

A spiritual vortex among the red rocks in Sedona.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This spectacular track has run continuously since 1882.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The highest bridge in America was built for an almost unnervingly small amount of money.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The final resting place of New Orleans' most famous voodoo priestess.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

This two-room shotgun shack in Tupelo is the birthplace of a King.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Elvis's own personal tropical hideaway.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Stockholm's narrowest alley is barely over two feet wide.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's tiniest statue is of a small boy looking at the Moon.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

A subterranean house of worship carved right out of the bedrock.