A church of bones, decorated with 40,000 human skeletons.

Two stunning 17th-century libraries and a cabinet of curiosities.

A crucified and bearded female saint.

Steadily reminding Czechia of its past.

Monument to a suicide protesting the Soviet invasion.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

A Serbian church lit by chandeliers made of weapons.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

The most visited, and possibly most controversial, museum in Germany.

The largest known Ancient Egyptian obelisk.

Roman ruins top white travertine terraces formed by ancient hot springs.

Roman ruins, natural methane fires and a lovely beach.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

A Buddhist temple to honor insects that died for science.

A Hungarian optometrist's charming collection of Asian art and curiosities.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Where the lovelorn find a home for their sentimental keepsakes.