While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

One of the oldest lighthouses in the world has been in continuous use since it was first built in 1531.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

Relics from an era long gone, sit idle outside this Estonian museum.

Wars fought and wars won are remembered by these abandoned bunker ruins.

The widest natural waterfall in Estonia is a sight to see in all seasons.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

A wooden statue of an Estonian pagan god and King of the Setos stands atop a sacred hill.

Man-made mineral caves house massive bat colony.

This old and disused water tower has received a new life as an art gallery with a piano staircase.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

This Estonian watchtower looks like a big tree with two giant bird nests on it, complete with a "golden egg."

This abandoned office building is a lasting example of Soviet-era architecture.

Located behind the Riverside Pub is a nautical fantasy from one of the area's renowned street artists.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

A complicated contraption for telling time by the moon.

Cemetery established by the Victorians as a solution to the overflowing graveyards.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

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

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.