Stretching for 22 miles, the world's longest tree-lined avenue dates back to the early 17th-century.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.

Tiki luxury on Nob Hill.

Once part of a living village, these buildings now house exhibits showcasing historical aspects of life in Ireland.

Its exhibits are dedicated to educating the public about state terrorism in Mexico.

Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

An unusual vending machine designed to support mourners during funeral ceremonies at Zurich's largest cemetery.

Dining in this grain cellar feels like stepping onto a fantasy film set.

Study the Alien etchings in this fountain while you refill your water bottle.

Visit Europe's largest subterranean waterfall, carved by water from the glaciers of the towering peaks surrounding the valley.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

Formerly abandoned underground complex to keep royals safe from a nuclear war that never came.