These romantic 19th-century landscaped gardens are free to visit and offer spectacular views of Porto, Gaia, and the Douro River. Spend some time wandering the maze-like gardens, populated with luscious trees and flowers, take a couple of pictures, and then stop by one of the many fountains to admire the free-range peacocks.

Estádio do Dragão (The Dragon Stadium), is the home arena for FC Porto since 2003, and it is estimated to have cost €98 million. On this guided tour, you will see the presidential box, changing rooms, and dugouts.

The Swarovski Crystal Worlds in Wattens, just 12 km east of Innsbruck, count among Austria’s most visited attractions. Created by the world renowned Tyrolean crystal manufacturer, this unique museum represents a glittering fantasy realm where top artists of international reputation reveal their personal crystalline fables, inviting fasci-nated visitors to immerse themselves in a mesmerizing world of wonders.

The National Archaeological Museum, in Exarchia, is home to Ancient Greece’s most spectacular pieces. One room contains Schliemann’s finds from Mycenae, another has the famous frescoes from Santorini on display. There is also a fine collection of idols from the Cyclades and ceramics from all parts of the Mediterranean. The star of the museum is the Antikythera Mechanism, an ancient hand-powered orrery, described as the oldest example of an analogue computer used to predict astronomical positions and eclipses decades in advance. This scientific marvel is dated somewhere between 205 and 60 BCE.