The only castle in North America to ever house European sovereigns.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Frida Kahlo's childhood home, now a museum of her life and works.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Nordic giants resurrected from the sea and restored to their former greatness.

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

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

Climb to the top of its spiral spire for spectacular views of Copenhagen.

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

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

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

Copenhagen's celebrated theme park and gardens.

This legendary dessert was served to Nobel laureates for decades.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

The Swedish flag over this small naval fort signals that the nation is at peace.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

The only house in Oregon designed by the famous architect, Frank Lloyd Wright.

To commemorate a century of gold mining, this Australian city built a monument that features a replica of a 150-pound gold nugget found there in 1858.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.