Two nations form a rare four-sided border at the peak of a mountain, philosophical questions result.

The fairy tale castle of the "fairy-tale king."

The stones of this formerly witch-obsessed castle were used to build a church.

A small but immensely extravagant palace built by the "Night King."

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

It's good luck to be mocked by this monkey.

This floating sculpture of ice is a poignant reminder of nature's power.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Sloth rehabilitation center in the jungle of Costa Rica.

This Costa Rican topiary park is a surreal garden of unearthly delights.

This bridge was constructed from the rubble of the infamous Bastille.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.