Connect the dots (six spare but well-outfitted huts spaced approximately 35 miles/56 kilometers apart) on a weeklong mountain bike expedition that starts in the jagged San Juan Mountains and ends in Moab. Harder and more isolated than its twin, the venerable Telluride-Moab ride, the 215-mile (346-kilometer) Durango-Moab route presents navigational and bike-handling challenges and a sense of unfettered freedom."

Housed in a gorgeous Victor Horta designed building (it was originally a department store), walking into the Comic Strip Museum is like walking into another world. The guest is first welcomed to this popular attraction by a variety of Tintin relics, without doubt the country’s most famous comic export. They add a certain whimsy to the experience that doesn’t fade throughout the tour."

The high-flying transect of the Presidential Range should be on every hiker’s short list. Much of the 24-mile (39-kilometer) route cruises above timberline in the tundra zone, tagging 11 peaks along the way, including Mount Washington. On clear days, expect views that can stretch from the Atlantic Ocean into Canada."

The Hill of Crosses near Siaulai is a memorial to the pain over those who gave their lives in the fight against Communism, in the 1863 revolution and in the Partisan war between 1944 and 1956. It all started when three graves were found after people killed in the 1863 revolution and crosses erected over them. It’s been adding ever since. The hill has about a million crosses, but as visitors continue to hang their own small crosses on the larger ones it is quite impossible to estimate the real number."

When she was christened by the widow of her namesake in 1931, the President Coolidge was as opulent as any pleasure ship plying the world’s waters, with an elegant smoking lounge, a shopping arcade, even its own stock exchange. A decade later the Coolidge was converted to an Army transport ship to help with the war effort; she was bringing reinforcements to American troops in the South Pacific when she struck a mine and sank off the coast of Vanuatu. Penetration is superb, and skilled divers can explore the engine room and dining room, or drift along the promenade deck. The largest and most accessible wreck of the Second World War, the Coolidge is in a class of her own."

In the Chugach Mountains, first descents are still routine, and nameless peaks promise more skiable terrain than even the biggest resorts in the Lower 48. Valdez serves as base for five of the seven heli-ski outfits that work the Chugach, but only Points North takes off from Cordova. Its clients gain nearly exclusive access to a 2,000-square-mile (5,180-square-kilometer) chunk of mountains, then retreat to the Points North Orca Adventure Lodge, a converted cannery."

Adolphe Bridge has become an unofficial national symbol of sorts, representing Luxembourg's independence, and has become one of Luxembourg City's main tourist attractions. The bridge was designed by Paul Séjourné, a Frenchman, and Paul Rodange, a Luxembourger, and was built between 1900 and 1903. Its design was copied in the construction of Walnut Lane Bridge in Philadelphia, the United States."