A military fort has guarded the surrounding area from this key position since the 13th century.

After witnessing the rise and fall of three empires, this ancient city was finally destroyed by a series of earthquakes.

In 1914, Archduke Franz Ferdinand spent his final night alive at this luxurious hotel.

A crumbling monument to a now locally-extinct sport in Bulgaria's oldest ski resort.

Belgrade’s oldest restaurant has a rather unusual name.

This work of art is considered the world's longest mosaic.

This medieval fortress guards a monastery near the border of Serbia and Montenegro.

This jellyfish provides clean water for an entire Dutch province.

This ancient Roman aqueduct once funneled water to Diocletian's palace.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

Split's smallest church, and one of its oldest, has been reconstructed inside the city's Roman walls.

Rejoice at Amsterdam's ‘pop temple,’ a former church reborn as a raucous music venue.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

The only remaining wind-powered paper mill in the world.

This fifth-century church is one of the oldest Christian sites in the Balkans.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

This fortified town dating back to the 1400s is often described as an open-air museum and is a protected National Monument of Bosnia and Herzegovina.

This windmill has been grinding pigments for traditional paints for more than 200 years.

Widely advertised as Amsterdam’s narrowest street, this passage was once a highlight of the Red Light District before its windows closed.

The famous springs of this small town still flow outside this historic building.

Iran's "Rose Garden Palace," built during 131 years of rule by Qajar kings, consists of 17 stunning structures.

A small self-proclaimed micro-state located on a piece of disputed territory between Croatia and Serbia, near Liberland.

This 135-year-old weather station studied the effects of the climate on human health.

This Dutch statue is a monument to the fictional shrew who brought doom to the city of Stavoren.