This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Depending on the region's rainfall, this church may be partially submerged.

The cross-shaped memorial is filled with kitschy tributes to the late pop star.

Space-age monument to an early 20th-century uprising.

A historical puzzle lies at the origins of this structure.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

A narrow strip of land is home to the tallest migrating dunes in Europe.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

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

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A beautifully eclectic mix of architectural styles.

The location of the world's first telescope demonstration.

This futuristic German television spire is actually the world's largest digital clock.

A famous big wave from Japan serves as a tribute to the victims of the disastrous Elbe flood.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

The largest tea plantation in Southeast Asia supplies gorgeous vistas alongside tea for the surrounding countries.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.