Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

The world's oldest bookshop still in operation.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Bridges, terraces, and replicas of historic structures all built of rock and petrified wood by one man.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

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

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

This massive underground salt mine now holds a sci-fi theme park in its depths.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

Hans Christian Andersen for the postmodern world.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

An old Danish political institution where members of government can grab a drink off the record.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A hidden three-foot-wide house separates these two regal churches.