4 Best Sights in Stuttgart, Heidelberg and the Neckar Valley

The stunning futuristic architecture of this museum is an enticement to enter, but the equally stunning historic and futuristic vehicles inside are the main attraction. Visitors are whisked to the top floor to start this historical timeline tour of motorized mobility in the 1880s, with the first vehicles by Gottlieb Daimler and Carl Benz. Other museum levels focus on a particular decade or category of vehicle, such as trucks and buses, race cars, concept cars, and future technology, including autonomous driving. Historic photos and other artifacts line the walls of the circular walkway that links the levels.  There's a huge gift shop with all kinds of Mercedes-Benz–branded items and a new-car showroom you can muse over appealing models that are sold in Europe but not in North America. If all that technology makes you hungry, enjoy a full meal at Bertha's Restaurant, named for Bertha Benz, which serves farm-fresh local fare, or a quick bite in the Bistro or Deli.

This former residence of the counts and dukes of Württemberg was originally built as a moated castle around 1320. Wings were added in the mid-15th century, creating a Renaissance palace. The palace now houses the Landesmuseum Württemberg (Württemberg State Museum), with exhibits tracing the area's development from the Stone Age to modern times and a floor of jaw-dropping family jewels of the fabulously rich and powerful Württemberg royals. There's also a separate floor dedicated to a children's museum.

In the center of the Porsche factory complex in the northern suburb of Zuffenhausen, the architecturally dramatic building expands outward and upward from its base, like a sports stadium. Inside is a vast collection of legendary and historic Porsche cars including racing cars, nearly 1,000 racing trophies and design and engineering awards, and several vehicles designed by Ferdinand Porsche that eventually became the VW Beetle. It is astounding how some 1930s models still look contemporary today. The museum includes a coffee shop and the Boxenstopp bistro, ideal for families, open during regular museum hours. There is also the sophisticated Christophorus restaurant, regarded as the best American-style steak house in Stuttgart, open Tuesday through Saturday until midnight. The gift shop sells some Porsche-branded logo clothing, but mostly miniature collectibles. Stand under the special "cones" on the upper level to hear the different engine sounds of various Porsche models, and try out the interactive "touch wall" timeline to explore nine decades of automotive history. Factory tours are available with advance arrangements.

This not-to-be-missed museum displays one of the finest art collections in Germany. The old part of the complex, dating from 1843, has paintings from the Middle Ages through the 19th century, including works by Cranach, Holbein, Hals, Memling, Rubens, Rembrandt, Cézanne, Courbet, and Manet. Connected to the original building is the Neue Staatsgalerie (New State Gallery), designed by British architect James Stirling in 1984 as a melding of classical and modern, sometimes jarring, elements (such as chartreuse window mullions). Considered one of the most successful postmodern buildings, it houses works by such 20th-century artists as Braque, Chagall, de Chirico, Dalí, Kandinsky, Klee, Mondrian, and Picasso. Visit both sections on the same ticket.