Built for an exposition in 1915, these horticultural displays have stood the test of time.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A second generation sun-powered marvel lights up the night.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

Breathtaking and huge 430 year old maps of Italy.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Spain's largest bullring offers a unique glimpse at architecture and history.

This little-known national museum houses over 40,000 works of art from across the world.

One man's remarkable private collection of art from around the world.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Inside this Krakow church, an explosion of psychedelic color.

In the summer, the area around this sculpture transforms into a vibrant concert venue.

One of the world's largest collections of medieval religious art.

A 20th-century picture show in 3-D.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Europe's official "zero-level," the equator of elevation.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.