Four-story concrete hotel never opened to customers.

A luxury hotel constructed out of a former jail.

Breathtaking and huge 430 year old maps of Italy.

An ancient knight and a symbol of the city's freedom.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

Texas's oldest bakery serves authentic German pastries, including legendary strudel.

Abandoned Italianate architecture on the coast of Maine.

Explore the dark underground corridors of this graffiti-covered former military fortification.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Alexander Hamilton’s creation caused quite a bit of controversy.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The curiosities and wonders of pharmacy in a delightful historic building.

The only rotating bar in New Orleans has been slowly spinning since 1949.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

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

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

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Turning night into day in Victorian-era Austin to thwart a serial killer.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."