NATIONAL monuments skulk in the smog.

人民英雄纪念碑躲藏在雾霾之中；

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The San Francisco Cable cars are the only mobile National Monuments.

旧金山的缆车是美国唯一的移动国家古迹。

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It has great national monuments, from the Smithsonian museums to the Library of Congress.

从史密森尼博物馆到美国国会图书馆，它拥有很多意义非凡的民族纪念碑。

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But a law called the Antiquities Act gives presidents the power to declare national monuments.

VOA: special.2009.09.28

Presidents can declare national monuments, but Congress must act to establish a national park.

VOA: special.2011.04.11

Teddy Roosevelt himself declared eighteen national monuments.

VOA: special.2009.09.28

The national monuments will be open to the public, but Chambers asked that visitors be especially vigilant.

CNN: Security tight for September 11 anniversary

From that sense of commitment sprang five National Parks, 18 National Monuments, 51 Federal bird reservations, and 150 National Forests.

WHITEHOUSE: Presidential Proclamation -- National Park Week, 2012

And over the years, over 100 sites have been set aside as national monuments -- everything from the Statue of Liberty to the Grand Canyon.

WHITEHOUSE: President Obama Designates Fort Monroe a National Monument | The White House