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

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

A gothic church dedicated to the love of wine.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

A striking symbol of the Bulgarian capital.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

A mysterious "wedding cake" castle in the middle of the urban desert.

The ruins of this prominent glass factory yield hidden treasures buried among the jungle floor.

The iconic castle that withstood a magnitude 6.2 earthquake has become a symbol of resilience.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A library of only unpublished manuscripts.

This giant Buddha statue has 125,000 smaller Buddhas hidden inside it.

This underwater old Texas hill town only resurfaces during harsh drought.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.