The prototype for all Nazi concentration camps.

A small but immensely extravagant palace built by the "Night King."

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

This "floating railway" is one of the world's oldest monorail systems.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

The fairy tale castle of the "fairy-tale king."

The remnants of the base where US Army troops learned how to fight in extreme conditions.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

There are eight natural springs around town, each with a slightly different taste.

A fake mine that was made using real mining techniques which is also used as a community center.

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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

This museum offers an actual time machine back through Colorado's past.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.