Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

A fantastical bed and breakfast with magically unique rooms.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This cemetery features modernist statues as strange as its name.

An enormous and lavish Gothic church in Czechia.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This half-finished "city of toys" was almost Italy's own Las Vegas.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

Pilgrimage site for star-crossed lovers.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

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

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

A particularly disconcerting tribute to Irish martyrs.

One of Ireland's most infamous prisons for rebels including men, women and children.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

A former French military respite turned jungle tourism hotspot.