This beautiful example of neoclassical architecture is one of Uruguay's most treasured cultural gems.

Ride the subways of yesteryear.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Mysterious stone tower featured in many alternative histories of the New World.

Oldest synagogue in the United States.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Underground tunnels remain beneath this abandoned mental asylum.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

This colossal war machine is now a living museum dedicated to underwater warfare.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

An unusual round church in London with a Templar past.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

The largest collection of hair jewelry in Europe reminds you how creepy 19th-century love was.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

This trio of stone spires claims to be the only preserved medieval execution site in Europe.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

Old Danish castle immortalized in Shakespeare's Hamlet.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.