View Spots: the Museum of Flight, Underground Tour, Seattle Public Library, Seattle Aquarium, GUM WALL, Experience music project.

景点：飞行博物馆，地下城之旅，西雅图公共图书馆，西雅图水族馆，口香糖墙，西雅图音乐体验馆。

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Tour highlights include the Roman city of Dougga, the underground Numidian capital at Bulla Regia, Roman Sbeitla and the remote areas around Tataouine and Matmata, uique for underground cities.

旅游亮点包括罗马的杜嘉城，位于布拉雷加的 Numidian 地下首都，Roman Sbeitla，以及塔塔旺和 Matmata 周围的偏远地区，这些都是地下城市。

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He was on this big underground communication west coast tour.

他对这个大的地下通信西海岸之旅。

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This spider's web of narrow tunnels, complete with coffin-sized cavities, opens out into dark subterranean churches - a most evocative way to end an underground tour of Rome.

BBC: Going underground at the Colosseum

In the guided tours category, those ideas include the Seattle Underground Tour, which takes visitors through parts of Seattle buildings that were largely built over after the Great Fire of 1889.

CNN: Natural wonders: A top 10 list

Kitsch roars its dinosaury head at Grand Canyon Caverns, luring you 21 stories underground for an ubercool cavern tour and even an overnight stay.

BBC: Arizona��s top five scenic drives