With a floor made of thick glass, this observation deck offers a full view of Sunwapta Valley's mountains and rivers.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A medieval weapon rumored to have been used by the brilliant poet himself.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Drink wine handed out through a window as part of an age-old tradition.

The oldest operating pharmacy in the world features 800-year-old recipes.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The middle finger of modernity.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

Museum dedicated to the terror regimes of Hungary.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A spherical "micro-nation" in the heart of Vienna.

This strange statue features a bust of the famous composer plopped atop a woman's body.

One man's personal kunstkammer, museum and shop.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.