Embark on the Crystal Mahler at beautiful port of Vienna.

Once the capital of the Austro-Hungarian Empire and forever known for its manicured gardens, ornate architecture - especially that of the famed Ringstrasse - and distinguished roster of composers who either were born or lived here, Vienna finds itself at the very center of European culture, even as it sits near the border of the Czech Republic, Slovakia, and Hungary.

Considered one of the most visited tourist spots in the Wachau Valley, Durnstein is in a robust wine-growing region sitting alongside the Danube river. Durnstein Castle, the region's famous architectural highlight, sits atop a rocky mountain, high above the Danube, at its base. Durnstein's beauty is enhanced by verdant forests, rolling hills, and thriving vineyards that surround the town. Sip some of the region's local wines and enjoy a leisurely day in this postcard-worthy European town.

Today you will also cruise the Scenic Danube Wachau Valley.

Next, your destination is Melk for this day. Best known for its fortified baroque Benedictine monastery, Melk Abbey, the town of Melk boasts an assortment of smaller gems. Among them, the city’s riverside location, serene and regal with a ribbon of wooded groves giving way to the lovely village. Cobbled lanes and a petite size make for a pleasant stroll with a chance to discover its 16th-century Town Hall, or Rathaus, in the center of town, and Haus am Stein or House at the Rock. Built-in the 15th century, the vine-covered abode is Melk’s oldest building.

Named the European Capital of Culture in 2009 and added to the roster of UNESCO Creative Cities as a City of Media Arts in 2014, Linz embraces the present and future, with reverence to its past. The city’s layout reflects its history, with an ancient medieval center encircled by neoclassical, neo-baroque and neo-Renaissance neighborhoods.

At the confluence of the Danube, Inn and Ilz rivers, Passau is also situated at a meeting of cultures. The town began as a Roman settlement, enjoying the rising tide of influence as the largest bishopric in the Holy Roman Empire and enduringly vibrant as a hub for various trade pursuits, including salt, swords, and ideas. Wander the cobbled streets of Old Town, gaze upon arched bridges and Italianate manses and visit magnificent St. Stephen’s Cathedral and New Bishop’s Residence.

This buzzing capital city is the heartbeat of Slovakia; a historic gem that stirs the imagination. A maze of cobblestone streets winds around 18th-century buildings and a pulsating modern art scene. Explore the museums, cathedrals, and palaces, and relax at a shade-covered sidewalk café. Photography buffs will want to snap images of the medieval castle looming high above the city.

Commanding both sides of the Danube – with the Chain Bridge connecting hilly Buda with flat Pest – Hungary’s capital enchants with its magnificent architecture of domes and spires, 18th-century homes, bridges, and lampposts. The UNESCO-listed Castle Hill welcomes all to explore Buda Castle, Trinity Square, Matthias Church, and Fisherman's Bastion.

Once the capital of the Austro-Hungarian Empire and forever known for its manicured gardens, ornate architecture - especially that of the famed Ringstrasse - and distinguished roster of composers who either were born or lived here, Vienna finds itself at the very center of European culture, even as it sits near the border of the Czech Republic, Slovakia, and Hungary.

After breakfast aboard the Crystal Mahler disembark at port of Vienna.