To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

A hidden path at the National Theatre lets you look behind the scenes of the latest productions.

The final resting place for the remains of 143 Habsburg royalty.

The house that took a plunge into the facade of a museum.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

An exquisite Baroque church in Vienna's old town.

Legends surround an ancient tree trunk riddled with nails for good luck.

This cubist Vienna church building looks like some sort of alien stonehenge.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

A memorial to the murdered Jews of Kaunas.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.