No fly-by-night

A German federal court has upheld a ban on flights between 11 p.m. and 5 a.m. at Frankfurt Airport, the country's busiest and one of Europe's major hubs.

The state of Hesse, where the airport is located, originally gave permission for 17 night flights at the airport. But a state court struck that down last year and the Federal Administrative Court upheld the decision Wednesday.

Neighbors have complained about the disruption caused by night flights.

Interpreting the National Mall

The National Park Service is bringing interpretive bus tours back to the National Mall after the previous tour operator went out of business.

Open Top Sightseeing now has a National Mall route for its familiar double-decker buses under a contract running through 2014.

The new route will include more than two dozen stops, including the Capitol, Smithsonian museums and at major memorials.

Visitors will be able to hop on and off throughout the day. Tickets are $32 for adults and $20 for children. Children younger than 5 are free.

Walk, then fly

The Indianapolis International Airport and the American Heart Association opened three new walking paths Wednesday, the day the association has dubbed National Walking Day.

They say all visitors can traverse a quarter-mile path around the ticketing hall. Travelers who've passed through security checkpoints can walk half-mile laps around each concourse or a 1.1-mile lap around both concourses. More than 20,000 travelers pass through the airport on an average day and about 10,000 people work there.

The Heart Association says walking vigorously for 30 minutes per day can reduce high blood pressure and cholesterol, reducing the risk of heart disease and stroke.

Courting Olympics

California and Nevada officials are joining forces to lure the Winter Games back to the Lake Tahoe area in 2022, forming an exploratory committee to start the process.

California Lt. Gov. Gavin Newsom and Nevada Lt. Gov. Brian Krolicki announced the merger of two separate state committees that had been exploring a possible bid for the Olympics.

If successful, the games would return to the United States for the first time since Salt Lake City hosted the Winter Olympics in 2002. Squaw Valley, a resort on the California side of Lake Tahoe, hosted the Winter games in 1960. The lake is ringed by ski resorts on or near its shores, on both sides of the state line.

Dixie Weekend

The Dixie National Forest's Red Canyon Visitor Center in Utah now is open for weekends. The center will be available Fridays through Mondays for the rest of April, then will stay open 9 a.m. to 6 p.m. seven days per week starting May 1.

The center features a book store, art gallery, and displays on the night skies and the area's geology.

Civil War Online

The National Park Service has launched a website that provides an overview of the Civil War and a guide to more than 1,700 sites around the nation related to the war that divided the nation.

Among those 1,700 sites are more than 100 national parks with Civil War themes. The narrative on the war examines its root causes; biographies of major players, military and civilian; and places within the national park system that help illuminate the war.