Ancient barriers wrap around what was once an important stop along the Silk Road.

The Avenue of Mausolea is a series of grand palatial tombs.

Light still pours into the ruins of this ancient Islamic observatory.

Visitors can sit and study the board with this Estonian chess legend and International Grandmaster.

The first designer power line in Estonia.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

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

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

This little gem in the Gulf of Riga has a very rich heritage and distinct culture.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

For the last century, this international border within a small town has appeared and disappeared various times.

Huge stairway leads to this massive gallery.

Destruction from Armenia's 1988 earthquake inspired an artist's sculptures of scrap metal.

This modern tandoor eatery was once a canteen for Soviet farmers.

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Over time, this castle grew to encompass the entire island.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

This tower once served as a radar station during the Cold War.

A scale rocket of an Ariane 5 rocket serves as a monument to a pioneer of space science.

A fortress off the West coast of Portugal that dates back to 1502.