Two very green residential towers cleaning the air in one of Europe's most polluted cities.

The secret medieval communication system will whisk your words above the noise of the crowd.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This sculpture honors the man who was known as the "Righteous Among the Nations."

Museum dedicated to the terror regimes of Hungary.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This strange statue features a bust of the famous composer plopped atop a woman's body.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The metal leaves on this tree are engraved with the names of Holocaust victims.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

A memorial to the murdered Jews of Kaunas.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Relics from an era long gone, sit idle outside this Estonian museum.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.