The old city had been ignored until parts of it were excavated for underground tours.

The guided underground tour takes an hour.

The Museum, which offered an underground tour to visitors, operated for twelve years, but finally closed in August 1991 because of drainage problems.

She planned on catching the last underground tour of the evening.

An underground tour of portions of the old city began just a few blocks to the north.

This was not a part of the old city that was covered by the underground tour.

The underground tour, which leaves from the market town of Dolgellau, costs about $15.

The underground tour is guided by former miners, who are able to answer many questions on the coal mining process.

In summer, living-history weekends are popular; an underground tour is due to open in 2010.

An underground tour of historic subway sites and renovations.