One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A fitting attraction for the corn capital of the world.

Elaborate drama imparts an appreciation for 19th century hardships.

A museum dedicated to the alleged Roswell Incident.

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

Remembering the Alamo with a full-scale replica of the 1836 city.

Three hundred years of preserved Spanish colonial history in San Antonio.

Museum dedicated to the terror regimes of Hungary.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The prototype for all Nazi concentration camps.

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

Tiny castle in the middle of the Rhine made you pay to pass.

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

Legendary site where an evil bishop was devoured by rodents.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The most visited, and possibly most controversial, museum in Germany.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Cold war icon and onetime "hole" in the iron curtain.

Metro station with a claim to rock n' roll fame.

World's largest collection of serial killer artwork and other macabre exhibits.

Cadillac where country's first big star was found dead.