Paris’ opera house is an awe-inspiring monument that is largely skipped over by tourists. Built during the mid to late 1800s, it isn’t hard to understand why this was the place to be seen at the height of its popularity. The interior of the opera house is filled with rich decoration and excessive ornamentation – think gold everywhere! Guided and unguided tours are available, but if you really want to learn all the history of this amazing place, make sure to stick with a guide. Who knows, you might even catch a glimpse of the famous Phantom of the Opera.