A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Romania's triumphal arch looks out over Bucharest.

An underground magnet for ever-changing street art.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Fantastic views and thousands of love locks.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

An iron dragon with a long neck covered in feathery scales perched above one of Venice's most popular squares.

Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

This sprawling, Brutalist estate feels like a city within a city.

These otherworldly limestone formations jut out from the Kansas prairie.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Two stone columns flank the grand Venice square, but there were supposed to be three.

These elaborate gothic monuments honor Verona's medieval lords.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Atop the former site of a historic bakery sit two stone tributes to Verona's contribution to traditional Italian baking.

Pilgrimage site for star-crossed lovers.

This Italian foot path winds through the mountains via 52 individual tunnels.

The 1940s structure houses what was once Europe's largest telescope.